Lettered Geometric Constructions (Verso)
Faint pen triangles and arc constructions keyed by diagram letters
The verso carries faint pen constructions — a triangle capped by two compass arcs at the top, larger triangles and a pyramid-like figure at the centre, and a small triangle below. The only transcribed text is a string of diagram letters (a-b-c-gdf-e) keying the figures. The Ambrosiana catalogue additionally tags the sheet with notes on meteorological effects, sailing and the effects of winds, none of which are evident in the transcribed material.
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Lettered triangle-and-arc constructions
Faint pen figures cover the sheet, including a triangle surmounted by compass arcs with lettered points, a central pyramid-like figure and a small triangle below. The accompanying labels read a-b-c-gdf-e, keying the vertices of the constructions.